SU913017A1 - Linear displacement converter - Google Patents

Description

The invention relates to mechanical engineering and can be used for high-precision measurements with a small measuring force.

The closest to the proposed is a linear displacement transducer, comprising a housing, with a base surface, two sensitive elements mounted on it, the axes of which are perpendicular to the base surface, a bracket with a support surface located at the same distance between the sensitive elements perpendicular to the base surface, mounted on the support surface the bracket with its two ends alone. flat suspension springs, bonded to the other ends of the suspension springs U-shaped rocker, · eremychka which is offset from the centerline of suspension springs ^ direction of the base surface of the housing, fixed on the bridge parallel to the base surface of the anchor plate, the ends of which interact with the sensing elements, and the measuring feeler rod · s [1].

In this converter, the displacement of the plate anchor occurs ”10

15

20

25

thirty

Diet due to deformation of the suspension springs, and therefore the measuring force has a high gradient, "which is unacceptable under small measuring conditions.

The purpose of the invention is to reduce the gradient of the measuring force.

This goal is achieved by the fact that the linear displacement transducer is equipped with a tensioning device, made in the form of two flat tension springs fixed in their same ends on the jumper of the rocker, placed in the same plane with the suspension springs parallel to them, and two extension springs fastened together by their ends to the body , and others - with the other ends of the tension springs, and the geometrical dimensions of all., the springs are chosen from the condition of equality of the torque of the reaction forces of the suspension springs to the torque created by the tension m device ..

FIG. 1 shows a linear displacement transducer circuit; in fig. 2 shows section A-A in FIG. one.

The converter includes a housing 1 with a base surface 2, two sensitive elements ^{3 91} installed on it

_g ment 3 and 4, bracket 5, fixed to bracket 5 two flat, suspension springs 6 and 7, fastened with co-free ends of springs 6 and 7 11-shaped rocker arm 8, fixed on the jumper of the rocker arm 8 anchor 9, the ends of which interact with sensitive elements 3 and 4, and a measuring rod 10 with a probe 11, fixed at their ends on the jumper of the rocker arm 8 two flat tension springs 12 and 13, placed in the same plane with the suspension springs 6 and 7 parallel to them, and two springs 14 and 15 extensions . ·

The stiffness of the bi7 springs, 12 and 13,

14 and 15 and the distance from the fixing points of the springs? Kin 12 and 13 to the middle line of the springs b and 7 are chosen from the condition that the moment of reaction forces of springs 6 and 7 is equal in magnitude and opposite to the sign of the moment of forces created by springs 12, 13, 14 and 15, which form a tensioning device. ·

The operation of the transducer is as follows

In the initial state, the probe 11 occupies a position in which the gaps formed by the anchor 9 are equal. In this case, the tensioning device provides the specified measuring force.

When measuring the probe 11 moves under the action of the measured value, which leads to rotation of the rocker arm 8. Flat springs b and 7 bend and create a moment of forces applied to the rocker arm 8 and proportional to the angle of rotation of this rocker arm. Since the attachment point of the springs 12 and 13 to the yoke 8 is offset relative to ι the middle line of the springs b and 7 in the direction from the base surface 2, there is a torque generated by the springs 12, 13, 14 and 15, applied to the yoke, directed to the side. opposite to the direction of the moment created by the springs 6 and 7. The moment created by the springs 12, 13, 14 and 15 is also proportional to the angle of rotation of the rocker arm 8 and at a certain ratio of tension force, stiffness of springs 6 and 7 and the distance from the spring attachment points. 13 to the center line of the 6 and 7 holes is equal to the moment created by the springs 6 and 7. This ensures the constancy of emery ^{7 4}

force when moving the probe 11 within the specified limits.

Thus, this converter provides a reduction in the measuring force gradient, which improves the accuracy and stability of measurements and can give a certain economic effect when it is introduced into the industry.

Claims (1)

Claim A linear displacement transducer, comprising a housing with a base surface, two sensitive elements mounted on it, the axes of which are perpendicular to the base surface, a bracket with a supporting surface located at the same distance between the sensitive elements perpendicular to the base surface, and two flat ones on the supporting surface of the bracket suspension springs bonded to the other ends of the suspension springs U-shaped rocker, the jumper of which is offset from the middle lin s suspended springs in the direction from the base surface of the housing, mounted on the jumper parallel to the base surface plate anchor, the ends of which interact with sensitive elements, and the measuring rod with a probe, characterized in that, in order to reduce the gradient of the measuring force, it is equipped with a tensioning device made in the form of two flat tension springs, fixed in the same plane with the suspension springs parallel to them, and two springs p fixed by their ends on the jumper of the rocker arm concretions, held together by one its ends to the body, and the other - the other ends of the tension springs, and geo. The metric dimensions of all the springs are chosen from the condition of equality of the torque of the forces of the suspension springs to the torque generated by the tensioner.